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<meta name="description" content="表单在网页中主要负责数据采集功能。一个表单有三个基本组成部分： 表单标签：这里面包含了处理表单数据所用CGI程序的URL以及数据提交到服务器的方法。 表单域：包含了文本框、密码框、隐藏域、多行文本框、复选框、单选框、下拉选择框和文件上传框等。 表单按钮：包括提交按钮、复位按钮和一般按钮；用于将数据传送到服务器上的CGI脚本或者取消输入，还可以用表单按钮来控制其他定义了处理脚本的处理工作。 表单 表">
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        <p>表单在网页中主要负责数据采集功能。一个表单有三个基本组成部分： 表单标签：这里面包含了处理表单数据所用CGI程序的URL以及数据提交到服务器的方法。 表单域：包含了文本框、密码框、隐藏域、多行文本框、复选框、单选框、下拉选择框和文件上传框等。 表单按钮：包括提交按钮、复位按钮和一般按钮；用于将数据传送到服务器上的CGI脚本或者取消输入，还可以用表单按钮来控制其他定义了处理脚本的处理工作。</p>
<h3 id="表单"><a href="#表单" class="headerlink" title="表单"></a>表单</h3><p><img src="http://assets.qipo.net/form.png" alt></p>
<p>表单组成:<br>对于表单构成中的表单控件,提示信息和表单域,初学者可能比较难以理解,对他们的具体解释如下:</p>
<ul>
<li>表单控件:包含了具体的表单功能项,如单行文本输入框,密码输入框,复选框,提交按钮,重置按钮等.</li>
<li>提示信息:一个表单通常还需要包含一些说明行的文字,提示用户进行填写和操作.</li>
<li>表单域:它相当于一个容器,用来容纳所有的表单控件和提示信息,可以通过他定义处理表单数据所用的程序的url地址,以及数据提交到服务器的方法.如果定义表单域,表单中的数据就无法传送到后台服务器.</li>
</ul>
<h4 id="form标签"><a href="#form标签" class="headerlink" title="form标签"></a>form标签</h4><p>在HTML中,form标记被用于定义表单域,即创建一个表单,以实现用户信息的收集和传递,form中的所有内容都会被提交给服务器.创建表单的基本语法格式如下:</p>
<figure class="highlight sqf"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">&lt;form <span class="built_in">action</span>=<span class="string">"xxx/xxx.cgi"</span> method=<span class="string">"get"</span> <span class="built_in">name</span>=<span class="string">"form1"</span>&gt;</span><br><span class="line">  &lt;input <span class="built_in">type</span>=<span class="string">"text"</span> <span class="built_in">name</span>=<span class="string">"name"</span> value=<span class="string">""</span>/&gt;</span><br><span class="line">  ...</span><br><span class="line">&lt;/form&gt;</span><br></pre></td></tr></table></figure>
<p>form标签具体属性解释:</p>
<ul>
<li>action,属性用于指定接收并处理表单数据的服务器程序的url地址.</li>
<li>method,属性用于设置表单数据的提交方式,其取值为<code>get</code>或者<code>post</code>.</li>
<li>name,属性用于指定表单的名称,用来区分同一个页面中的多个表单.</li>
</ul>
<h4 id="input控件"><a href="#input控件" class="headerlink" title="input控件"></a>input控件</h4><p>input控件的基本语法格式如下:</p>
<figure class="highlight lua"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">&lt;<span class="built_in">input</span> <span class="built_in">type</span>=<span class="string">"input类型"</span>  /&gt;</span><br><span class="line"></span><br><span class="line">//在上面的语法中,&lt;<span class="built_in">input</span> /&gt;标记为单标记,<span class="built_in">type</span>属性为最基本的属性,其取值有很多种,用于指定不同的控机类型.除了<span class="built_in">type</span>属性之外,&lt;<span class="built_in">input</span> /&gt;标记还可以定义很多其他属性,其常用属性如下表所示.</span><br></pre></td></tr></table></figure>
<p><img src="http://assets.qipo.net/input.jpg" alt></p>
<p>实例:</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE html&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>表单<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">form</span> <span class="attr">action</span>=<span class="string">""</span> <span class="attr">method</span>=<span class="string">"get"</span> &gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">maxlength</span>=<span class="string">"20"</span> &gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">      <span class="comment">&lt;!-- 单行文本输入框  其maxlength属性会导致其输入的最大字符数为20--&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"password"</span> <span class="attr">value</span>=<span class="string">"123"</span> &gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">      <span class="comment">&lt;!-- 密码输入框,其输入显示为圆点 value属性用来设置默认值--&gt;</span></span><br><span class="line">      男<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"radio"</span> <span class="attr">name</span>=<span class="string">"sex"</span> <span class="attr">value</span>=<span class="string">"1"</span>&gt;</span> 女<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"radio"</span> <span class="attr">name</span>=<span class="string">"sex"</span> <span class="attr">value</span>=<span class="string">"0"</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">      <span class="comment">&lt;!-- 单选按钮 要想做到单选,必须让其name属性相同 这里填写value值,其不再是默认值,而是进行表单提交时,提交的值--&gt;</span></span><br><span class="line">      课程:<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"checkbox"</span> <span class="attr">name</span>=<span class="string">"yw"</span>&gt;</span>语文 <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"checkbox"</span> <span class="attr">name</span>=<span class="string">"sx"</span>&gt;</span>数学 <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">      <span class="comment">&lt;!-- 复选框 --&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"button"</span> <span class="attr">value</span>=<span class="string">"按钮"</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">      <span class="comment">&lt;!-- 普通按钮,value属性为其设置显示名称 --&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"reset"</span> <span class="attr">value</span>=<span class="string">"清空"</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">      <span class="comment">&lt;!-- 重置按钮,让整个表单清空,value属性其设置显示名称 --&gt;</span></span><br><span class="line">      这有个隐藏域--&gt;<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"hidden"</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">      <span class="comment">&lt;!-- 隐藏域 --&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"file"</span> <span class="attr">multiple</span> <span class="attr">accept</span>=<span class="string">"image/*"</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">      <span class="comment">&lt;!-- 文件域,供上传文件使用 multiple这个属性是多选,可以允许提交多个文件  accept属性用于指定文件类型,只能上传图片 --&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"submit"</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">      <span class="comment">&lt;!-- 提交按钮,会让整个表单提交 --&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"image"</span> <span class="attr">src</span>=<span class="string">"./timg.jpg"</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">      <span class="comment">&lt;!-- 图片形式的提交 --&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p>其浏览器显示如下:</p>
<p><img src="http://assets.qipo.net/2017-08-24%2019-24-40%E5%B1%8F%E5%B9%95%E6%88%AA%E5%9B%BE.png" alt></p>
<h4 id="textarea控件"><a href="#textarea控件" class="headerlink" title="textarea控件"></a>textarea控件</h4><p>如果需要输入大量的信息,那么就需要用到textarea标记.<br>通过textarea控件可以轻松的创建多行文本输入框,其基本语法格式如下:</p>
<figure class="highlight clean"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">&lt;textarea rows=<span class="string">"10"</span> cols=<span class="string">"10"</span>&gt;</span><br><span class="line">......</span><br><span class="line">&lt;/textarea&gt;</span><br></pre></td></tr></table></figure>
<p>实例:</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE html&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>textarea文本域<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">    文本域:</span><br><span class="line">    <span class="tag">&lt;<span class="name">textarea</span> <span class="attr">rows</span>=<span class="string">"10"</span> <span class="attr">cols</span>=<span class="string">"10"</span> <span class="attr">style</span>=<span class="string">"vertical-align:top"</span>&gt;</span></span><br><span class="line">      <span class="comment">&lt;!-- rows和cols分别设置行宽和列高,当然也可用width和height设置 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">textarea</span>&gt;</span></span><br><span class="line"></span><br><span class="line">  <span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
<h4 id="select控件"><a href="#select控件" class="headerlink" title="select控件"></a>select控件</h4><p>当点击下拉符号时,会出现一个选择列表.在HTML中,要想制作如下图所示的下拉菜单,就需要使用select控件.</p>
<p><img src="http://assets.qipo.net/select.jpg" alt></p>
<p>基本语法格式如下:</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">option</span>&gt;</span>选项1<span class="tag">&lt;/<span class="name">option</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">option</span>&gt;</span>选项2<span class="tag">&lt;/<span class="name">option</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">option</span>&gt;</span>选项3<span class="tag">&lt;/<span class="name">option</span>&gt;</span></span><br><span class="line">  ...</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p><code>&lt;select&gt;&lt;/select&gt;</code>标记用于在表单中添加一个下拉菜单,<code>&lt;option&gt;&lt;/option&gt;</code>用于定义下拉菜单中的具体选项,每对<code>&lt;select&gt;&lt;/select&gt;</code>中至少应包含一对<code>&lt;option&gt;&lt;/option&gt;</code>.</p>
<blockquote>
<p><select>和<option>的属性</option></select></p>
</blockquote>
<p><img src="http://assets.qipo.net/option.jpg" alt></p>
<h4 id="fieldset组合控件"><a href="#fieldset组合控件" class="headerlink" title="fieldset组合控件"></a>fieldset组合控件</h4><p>用于将form中的控件进行分组,fieldset没有必须或唯一的属性.<br><code>legend</code>用于给fieldset定义标题.</p>
<p>语法格式如下:</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">form</span> <span class="attr">action</span>=<span class="string">"test.php"</span> <span class="attr">method</span>=<span class="string">"post"</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">fieldset</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">legend</span>&gt;</span>Title<span class="tag">&lt;/<span class="name">legend</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"radio"</span> <span class="attr">id</span>=<span class="string">"radio"</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">fieldset</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p>其显示如下:</p>
<p><img src="http://assets.qipo.net/2017-08-24%2019-48-48%E5%B1%8F%E5%B9%95%E6%88%AA%E5%9B%BE.png" alt></p>
<h3 id="jQuery中的表单操作"><a href="#jQuery中的表单操作" class="headerlink" title="jQuery中的表单操作"></a>jQuery中的表单操作</h3><h4 id="表单选择器"><a href="#表单选择器" class="headerlink" title="表单选择器"></a>表单选择器</h4><p>:button<br>:checkbox<br>:checked<br>:disabled<br>:enabled<br>:focus<br>:file<br>:image<br>:input<br>:password<br>:radio<br>:reset<br>:selected<br>:submit<br>:text</p>
<h4 id="表单元素值操作"><a href="#表单元素值操作" class="headerlink" title="表单元素值操作"></a>表单元素值操作</h4><ul>
<li>val() 获得值</li>
<li>val(value) 设置值</li>
</ul>
<figure class="highlight markdown"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">// 从复选框获取选中值</span><br><span class="line">$( "input[<span class="string">type=checkbox</span>][<span class="symbol">name=bar</span>]:checked" ).val();</span><br></pre></td></tr></table></figure>
<figure class="highlight mel"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//设置文本框的值</span></span><br><span class="line">$(<span class="string">"input"</span>).val(<span class="keyword">text</span>);</span><br></pre></td></tr></table></figure>
<h4 id="表单的提交"><a href="#表单的提交" class="headerlink" title="表单的提交"></a>表单的提交</h4><p>对于表单而言,只要你点击提交按钮,表单就会提交一份数据交给服务器,即使表单中全是空.我们要做的是先在客户端判断,如果是空的,就去阻止表单去提交,直到它通过了客户端的验证.<br>想要做到这点,必须要提及的是jQuery中关于表单的事件<code>.submit()</code>,即表单的提交事件.<br><code>.submit()</code>:当用户试图提交表单时,就会在这个表单元素上触发<code>submit</code>事件.它只能绑定在<code>&lt;form&gt;</code>元素上.<br>详细代码如下:</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE html&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span><span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">style</span>&gt;</span><span class="undefined"></span></span><br><span class="line"><span class="undefined">      * &#123;</span></span><br><span class="line"><span class="undefined">        margin: 0;</span></span><br><span class="line"><span class="undefined">        padding: 0;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="css">      <span class="selector-id">#account</span> &gt; <span class="selector-tag">p</span> &#123;</span></span><br><span class="line"><span class="undefined">        color: red;</span></span><br><span class="line"><span class="undefined">        visibility: hidden;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined">    </span><span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="tag">&lt;<span class="name">form</span> <span class="attr">id</span>=<span class="string">"account"</span>  <span class="attr">action</span>=<span class="string">"/login"</span> <span class="attr">method</span>=<span class="string">"post"</span>&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">p</span>&gt;</span>用户名或者密码！<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"></span><br><span class="line">      <span class="comment">&lt;!-- input的name属性值必须和后端保持一致！！！！  --&gt;</span></span><br><span class="line">      username: <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">name</span>=<span class="string">"name"</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">      password: <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"passwd"</span> <span class="attr">name</span>=<span class="string">"passwd"</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">      <span class="tag">&lt;<span class="name">button</span>&gt;</span>登录<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="tag">&lt;<span class="name">script</span> <span class="attr">src</span>=<span class="string">"./js/jquery.min.js"</span>&gt;</span><span class="undefined"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">script</span>&gt;</span><span class="undefined"></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">    $(<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="actionscript">      <span class="comment">//submit事件</span></span></span><br><span class="line"><span class="javascript">      $(<span class="string">"#account"</span>).submit(<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">        <span class="keyword">var</span> username = $(<span class="string">"#account input[name=name]"</span>).val();</span></span><br><span class="line"><span class="javascript">        <span class="keyword">var</span> password = $(<span class="string">"#account input[name=passwd]"</span>).val();</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="actionscript">        <span class="keyword">if</span> ((!username) || (!password))&#123;</span></span><br><span class="line"><span class="javascript">          $(<span class="string">"#account &gt; p"</span>).css(<span class="string">"visibility"</span>, <span class="string">"visible"</span>);</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="actionscript">          <span class="comment">//阻止提交</span></span></span><br><span class="line"><span class="actionscript">          <span class="keyword">return</span> <span class="literal">false</span>;</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="actionscript">        <span class="comment">//成功，就自动提交</span></span></span><br><span class="line"><span class="undefined">      &#125;);</span></span><br><span class="line"><span class="undefined">    &#125;);</span></span><br><span class="line"><span class="undefined">    </span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"></span><br><span class="line">  <span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
<h3 id="练习"><a href="#练习" class="headerlink" title="练习"></a>练习</h3><ul>
<li>不填提交会显示红色的字体:用户或者密码不能为空.当光标移动到输入框时,其红色警告字消失.</li>
</ul>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE html&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>不用form，只用控件！！！！<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">style</span>&gt;</span><span class="undefined"></span></span><br><span class="line"><span class="undefined">      * &#123;</span></span><br><span class="line"><span class="undefined">        margin: 0;</span></span><br><span class="line"><span class="undefined">        padding: 0;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="css">      <span class="selector-class">.message</span> &gt; <span class="selector-tag">p</span> &#123;</span></span><br><span class="line"><span class="undefined">        color: red;</span></span><br><span class="line"><span class="undefined">        visibility: hidden;</span></span><br><span class="line"><span class="undefined">      &#125;</span></span><br><span class="line"><span class="undefined">    </span><span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line"></span><br><span class="line">   <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">"message"</span>&gt;</span></span><br><span class="line">     <span class="tag">&lt;<span class="name">p</span>&gt;</span>用户名或者密码不能为空！<span class="tag">&lt;/<span class="name">p</span>&gt;</span></span><br><span class="line"></span><br><span class="line">     用户名：<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">name</span>=<span class="string">"username"</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span><span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line">     密  码： <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"password"</span> <span class="attr">name</span>=<span class="string">"passwd"</span>&gt;</span> <span class="tag">&lt;<span class="name">br</span>&gt;</span><span class="tag">&lt;<span class="name">br</span>&gt;</span></span><br><span class="line"></span><br><span class="line">     <span class="tag">&lt;<span class="name">button</span> <span class="attr">id</span>=<span class="string">"login"</span>&gt;</span>登录<span class="tag">&lt;/<span class="name">button</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"></span><br><span class="line">   <span class="tag">&lt;<span class="name">script</span> <span class="attr">src</span>=<span class="string">"./jquery.min.js"</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>&gt;</span><span class="undefined"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">script</span> <span class="attr">type</span>=<span class="string">"text/javascript"</span>&gt;</span><span class="undefined"></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">   $(<span class="string">".message input"</span>).focus(<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="javascript">     $(<span class="string">".message p"</span>).css(<span class="string">"visibility"</span>, <span class="string">"hidden"</span>);</span></span><br><span class="line"><span class="undefined">   &#125;);</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">   $(<span class="string">"#login"</span>).click(<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="actionscript">     <span class="comment">//val方法是用于获得表单控件的值</span></span></span><br><span class="line"><span class="javascript">     <span class="keyword">var</span> username = $(<span class="string">".message input[name=username]"</span>).val();</span></span><br><span class="line"><span class="javascript">     <span class="keyword">var</span> passwd = $(<span class="string">".message input[name=passwd]"</span>).val();</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="actionscript">    <span class="comment">//  console.log(username, passwd);</span></span></span><br><span class="line"><span class="undefined">    /*</span></span><br><span class="line"><span class="actionscript">    username  或者 passwd 只要有<span class="number">1</span>个为空，那么就会执行<span class="keyword">if</span>中的语句。</span></span><br><span class="line"><span class="undefined">    */</span></span><br><span class="line"><span class="actionscript">    <span class="keyword">if</span> ((!username) || (!passwd))&#123;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="actionscript">      <span class="comment">//显示提示</span></span></span><br><span class="line"><span class="javascript">      $(<span class="string">".message p"</span>).css(<span class="string">"visibility"</span>, <span class="string">"visible"</span>);</span></span><br><span class="line"><span class="undefined">    &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="actionscript">    <span class="comment">//如果数据正确，需要将数据提交给后台！！！！</span></span></span><br><span class="line"><span class="actionscript">    <span class="comment">//??????</span></span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined">   &#125;);</span></span><br><span class="line"><span 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